|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|W. Hantzschel 1975||Dimorphous trace fossil consisting of small, straight, or curved double-ribbon trails, up to about 6 mm wide, transversely striated by fine furrows; both “ribbons” separated by median ridge; trail may be intermittent; associated with “coffee-bean”-shaped impressions of corresponding size.|